package bill;

import java.util.Scanner;

/*
* 本类测试String的charAt方法
* */
public class TestCharAt {
    public static void main(String[] args) {
        //charAt(3)返回指定下标的字符
        do {
            try {
                do {
                    char c = new Scanner(System.in).next().charAt(3);
                    System.out.println(c);
                } while (true);
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
            }
        } while (true);


    }
}
